// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_RENDERER_HOST_PEPPER_PEPPER_FILE_IO_HOST_H_
#define CONTENT_BROWSER_RENDERER_HOST_PEPPER_PEPPER_FILE_IO_HOST_H_

#include <stdint.h>

#include <string>

#include "base/callback_forward.h"
#include "base/files/file.h"
#include "base/files/file_proxy.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "content/browser/renderer_host/pepper/browser_ppapi_host_impl.h"
#include "content/public/common/quarantine.h"
#include "ipc/ipc_listener.h"
#include "ipc/ipc_platform_file.h"
#include "ppapi/c/pp_file_info.h"
#include "ppapi/c/pp_time.h"
#include "ppapi/host/host_message_context.h"
#include "ppapi/host/resource_host.h"
#include "ppapi/shared_impl/file_io_state_manager.h"
#include "storage/browser/fileapi/file_system_context.h"
#include "url/gurl.h"

namespace ppapi {
struct FileGrowth;
}

namespace content {
class PepperFileSystemBrowserHost;

class PepperFileIOHost : public ppapi::host::ResourceHost,
                         public base::SupportsWeakPtr<PepperFileIOHost> {
public:
    typedef base::Callback<void(base::File::Error)> NotifyCloseFileCallback;

    PepperFileIOHost(BrowserPpapiHostImpl* host,
        PP_Instance instance,
        PP_Resource resource);
    ~PepperFileIOHost() override;

    // ppapi::host::ResourceHost override.
    int32_t OnResourceMessageReceived(
        const IPC::Message& msg,
        ppapi::host::HostMessageContext* context) override;

    struct UIThreadStuff {
        UIThreadStuff();
        UIThreadStuff(const UIThreadStuff& other);
        ~UIThreadStuff();
        base::ProcessId resolved_render_process_id;
        scoped_refptr<storage::FileSystemContext> file_system_context;
    };

private:
    int32_t OnHostMsgOpen(ppapi::host::HostMessageContext* context,
        PP_Resource file_ref_resource,
        int32_t open_flags);
    int32_t OnHostMsgTouch(ppapi::host::HostMessageContext* context,
        PP_Time last_access_time,
        PP_Time last_modified_time);
    int32_t OnHostMsgSetLength(ppapi::host::HostMessageContext* context,
        int64_t length);
    int32_t OnHostMsgClose(ppapi::host::HostMessageContext* context,
        const ppapi::FileGrowth& file_growth);
    int32_t OnHostMsgFlush(ppapi::host::HostMessageContext* context);
    int32_t OnHostMsgRequestOSFileHandle(
        ppapi::host::HostMessageContext* context);

    void GotPluginAllowedToCallRequestOSFileHandle(
        ppapi::host::ReplyMessageContext reply_context,
        bool plugin_allowed);

    // Callback handlers. These mostly convert the File::Error to the
    // PP_Error code and send back the reply. Note that the argument
    // ReplyMessageContext is copied so that we have a closure containing all
    // necessary information to reply.
    void ExecutePlatformGeneralCallback(
        ppapi::host::ReplyMessageContext reply_context,
        base::File::Error error_code);

    void OnLocalFileOpened(ppapi::host::ReplyMessageContext reply_context,
        const base::FilePath& path,
        base::File::Error error_code);

    void OnLocalFileQuarantined(ppapi::host::ReplyMessageContext reply_context,
        const base::FilePath& path,
        QuarantineFileResult quarantine_result);

    void SendFileOpenReply(ppapi::host::ReplyMessageContext reply_context,
        base::File::Error error_code);

    void GotUIThreadStuffForInternalFileSystems(
        ppapi::host::ReplyMessageContext reply_context,
        int platform_file_flags,
        UIThreadStuff ui_thread_stuff);
    void DidOpenInternalFile(ppapi::host::ReplyMessageContext reply_context,
        base::File file,
        const base::Closure& on_close_callback);
    void GotResolvedRenderProcessId(
        ppapi::host::ReplyMessageContext reply_context,
        base::FilePath path,
        int file_flags,
        base::ProcessId resolved_render_process_id);

    void DidOpenQuotaFile(ppapi::host::ReplyMessageContext reply_context,
        base::File file,
        int64_t max_written_offset);
    bool CallSetLength(ppapi::host::ReplyMessageContext reply_context,
        int64_t length);

    void DidCloseFile(base::File::Error error);

    void SendOpenErrorReply(ppapi::host::ReplyMessageContext reply_context);

    // Adds file_ to |reply_context| with the specified |open_flags|.
    bool AddFileToReplyContext(
        int32_t open_flags,
        ppapi::host::ReplyMessageContext* reply_context) const;

    BrowserPpapiHostImpl* browser_ppapi_host_;

    int render_process_id_;
    base::ProcessId resolved_render_process_id_;

    base::FileProxy file_;
    int32_t open_flags_;

    // The file system type specified in the Open() call. This will be
    // PP_FILESYSTEMTYPE_INVALID before open was called. This value does not
    // indicate that the open command actually succeeded.
    PP_FileSystemType file_system_type_;
    base::WeakPtr<PepperFileSystemBrowserHost> file_system_host_;

    // Valid only for PP_FILESYSTEMTYPE_LOCAL{PERSISTENT,TEMPORARY}.
    scoped_refptr<storage::FileSystemContext> file_system_context_;
    storage::FileSystemURL file_system_url_;
    base::Closure on_close_callback_;
    int64_t max_written_offset_;
    bool check_quota_;

    ppapi::FileIOStateManager state_manager_;

    DISALLOW_COPY_AND_ASSIGN(PepperFileIOHost);
};

} // namespace content

#endif // CONTENT_BROWSER_RENDERER_HOST_PEPPER_PEPPER_FILE_IO_HOST_H_
